[MacPorts] #28221: Update: doxygen 1.7.2 -> 1.7.3

[MacPorts]

#28221: Update: doxygen 1.7.2 -> 1.7.3
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 Reporter:  andrew.porokhin@…          |       Owner:  css@…           
     Type:  update                     |      Status:  assigned        
 Priority:  Normal                     |   Milestone:                  
Component:  ports                      |     Version:                  
 Keywords:  haspatch                   |        Port:  doxygen         
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Comment(by css@…):

 I just did a clean system install, so I need to set aside some time
 tonight to run the build and all its dependencies. Thanks for the patch!

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Ticket URL: <https://trac.macports.org/ticket/28221#comment:4>
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